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Re: c5504-mrgn-l-002 is invalid

From: L. David Baron <dbaron@dbaron.org>
Date: Wed, 1 Dec 2010 09:00:04 -0800
To: fantasai <fantasai.lists@inkedblade.net>
Cc: public-css-testsuite@w3.org
Message-ID: <20101201170004.GA7504@pickering.dbaron.org>
On Tuesday 2010-11-30 22:54 -0500, fantasai wrote:
> On 10/14/2010 03:05 PM, L. David Baron wrote:
> >http://test.csswg.org/suites/css2.1/20101001/html4/c5504-mrgn-l-002.htm
> >http://test.csswg.org/suites/css2.1/20101001/xhtml1/c5504-mrgn-l-002.xht
> >assert that something that sticks out of a page to the left should
> >cause a horizontal scrollbar.  This requirement is not defined by
> >the spec and is interoperably *not* implemented.
> >
> >The test should be removed.
> 
> From http://www.w3.org/TR/CSS21/visufx.html#overflow-clipping
>   # Whenever overflow occurs, the 'overflow' property specifies
>   # whether a box is clipped to its padding edge, and if so,
>   # whether a scrolling mechanism is provided to access any
>   # clipped out content.                      ^^^^^^^^^^^^^
>     ^^^^^^^^^^^^^^^^^^^
> 
> From http://www.w3.org/TR/CSS21/visufx.html#overflow
>   # The 'visible' value when used for the viewport must be
>   # interpreted as 'auto'.
> 
> From the definition of 'overflow: auto':
>   # The behavior of the 'auto' value is user agent-dependent,
>   # but should cause a scrolling mechanism to be provided for
>   # overflowing boxes.
> 
> The test is marked as 'should', and is therefore not required
> to pass. But I don't see any reason to remove it as it does
> not in fact appear to be invalid.

If the point of the test is in fact to test that the horizontal
scrollbar allows scrolling to the left, the pass condition should
say that.  I suspect the implementations that are marked as passing
this test currently (although I can't actually find any) pass it
because they create a scrollbar that doesn't allow scrolling
anywhere.

I think if the pass condition is corrected to test what you think
the test should be testing, we'll have 0 passes for the test.

-David

-- 
L. David Baron                                 http://dbaron.org/
Mozilla Corporation                       http://www.mozilla.com/
Received on Wednesday, 1 December 2010 17:00:42 GMT

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